Grup bebas: Perbedaan antara revisi
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|journal=Geom. Funct. Anal. |volume=16 |year=2006|issue= 3|pages= 707–730|ref=harv|mr=2238945 |doi=10.1007/s00039-006-0565-8}}
*[[Jean-Pierre Serre|Serre, Jean-Pierre]], ''Trees'', Springer (2003) (English translation of "arbres, amalgames, SL<sub>2</sub>", 3rd edition, ''astérisque'' '''46''' (1983))
* P.J. Higgins, ''[http://doi.org/10.1112/jlms/s2-13.1.145 The fundamental groupoid of a graph of groups] {{Webarchive|url=https://web.archive.org/web/20230809151610/https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/jlms/s2-13.1.145 |date=2023-08-09 }}'', [[Journal of the London Mathematical Society]] (2) '''13''' (1976), no. 1, 145–149.
* {{Cite book
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